Description: 435 chemistry: molecular biology and microbiology / 435 chemistry: molecular biology and microbiology/(41) micro-organism, tissue cell culture or enzyme using process to synthesize a desired chemical compound or composition (117) preparing heterocyclic carbon compound having only o, n, s, se, or te as ring hetero atoms (120) nitrogen or oxygen hetero atom and at least one other diverse hetero ring atom in the same ring
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